The Following Section consists of Multiple Choice Questions on Furnace Technology.
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Furnace Technology MCQ
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Question 1 of 20
1. Question
1 pointsCement Kiln is a
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Question 2 of 20
2. Question
1 pointsIn a furnace employing forced draught as compared to induced draught,
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Question 3 of 20
3. Question
1 pointsWhich of the following is a heat treatment furnace ?
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Question 4 of 20
4. Question
1 points__________ atmosphere is maintained inside an iron blast furnace.
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Question 5 of 20
5. Question
1 pointsWhich furnace employs preheating, heating and soaking zones ?
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Question 6 of 20
6. Question
1 pointsCeramic recuperators compared to metallic recuperators for the same duty
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Question 7 of 20
7. Question
1 pointsWhich is the most thermally efficient furnace ?
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Question 8 of 20
8. Question
1 pointsCeramic recuperators (made of SiC) is economical, only when used for preheating combustion air above __________ °C.
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Question 9 of 20
9. Question
1 pointsWhich is a continuous furnace ?
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Question 10 of 20
10. Question
1 pointsWhich of the following is the most suitable for preheating combustion air above 650°C ?
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Question 11 of 20
11. Question
1 pointsSoaking pits are meant for heating steel
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Question 12 of 20
12. Question
1 pointsThe purpose of controlling the furnace atmosphere is to prevent surface attack by
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Question 13 of 20
13. Question
1 pointsThermal efficiency of a limestone calcination rotary kiln may be around __________ percent.
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Question 14 of 20
14. Question
1 pointsIn producer gas making furnace, steam is added along with air to mainly control the
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Question 15 of 20
15. Question
1 pointsFuel used in B.F. stove is
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Question 16 of 20
16. Question
1 pointsTunnel kilns are usually used for
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Question 17 of 20
17. Question
1 pointsThe thermal efficiency of a steel slab reheating furnace (walking beam type) may be about __________ percent.
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Question 18 of 20
18. Question
1 pointsHigher furnace temperature can not be achieved by use of a lean fuel gas in the furnace by
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Question 19 of 20
19. Question
1 pointsCeramic coating material for furnace refractory, which increases its emissivity and thus the radiation heat transfer rate in the furnace, comprises of
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Question 20 of 20
20. Question
1 pointsIn reverberatory furnace, charge is heated mainly by
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Furnace Technology MCQ 2
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Question 1 of 20
1. Question
1 pointsAn example of a periodic furnace is the
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Question 2 of 20
2. Question
1 pointsOstwald charts are meant for
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Question 3 of 20
3. Question
1 pointsWhich of the following is a natural draft furnace ?
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Question 4 of 20
4. Question
1 pointsLarge tonnage of refractory bricks are dried in a
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Question 5 of 20
5. Question
1 pointsWhich of the following is not a directly fired furnace ?
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Question 6 of 20
6. Question
1 pointsWhich of the following is not an additive for flue gases from furnace to reduce its dew-point?
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Question 7 of 20
7. Question
1 pointsAcid dew point temperature (ADT) of a flue gas produced by the combustion of a fuel containing 1% sulphur may be about __________ °C.
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Question 8 of 20
8. Question
1 pointsLow stack loss indicates the
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Question 9 of 20
9. Question
1 pointsThermal efficiency of blast furnace stoves used for heating blast (air) may be about __________ percent.
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Question 10 of 20
10. Question
1 pointsHeat transfer rate to the stock/charge in the furnace does not depend upon the
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Question 11 of 20
11. Question
1 pointsPower required in case of forced draught as compared to induced draught (for the same draught produced) is
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Question 12 of 20
12. Question
1 points__________ is an indirectly heated furnace.
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Question 13 of 20
13. Question
1 pointsThe thermal efficiency of an air/fuel gas preheating recuperator may be as high as __________ percent.
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Question 14 of 20
14. Question
1 pointsWhich is not a hearth furnace ?
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Question 15 of 20
15. Question
1 pointsAn example of shaft furnace is the
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Question 16 of 20
16. Question
1 pointsThe electric furnace in which heat is produced by a combination of induced current and skin effect is called __________ furnace.
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Question 17 of 20
17. Question
1 pointsUse of pulverised coal in boilers provides
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Question 18 of 20
18. Question
1 pointsIn which of the waste heat recovery equipment, the flow of flue gas and air is alternately reversed after a fixed interval of time ?
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Question 19 of 20
19. Question
1 pointsAn electric furnace producing heat by means of an electric arc struck between each of three electrodes and the charge is called __________ furnace.
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Question 20 of 20
20. Question
1 pointsTurndown ratio of a burner gives an idea of the __________ in the furnace.
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Furnace Technology MCQ 3
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Question 1 of 20
1. Question
1 pointsIn low or standard frequency induction furnace, heat is produced by the
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Question 2 of 20
2. Question
1 pointsWhich furnace employs natural draft ?
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Question 3 of 20
3. Question
1 pointsTest specimen for determination of refractoriness under load (RUL) of a refractory is heated in a
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Question 4 of 20
4. Question
1 pointsRegenerators are used for waste heat recovery in
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Question 5 of 20
5. Question
1 pointsWhich of the following furnaces will have maximum thermal efficiency ?
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Question 6 of 20
6. Question
1 pointsHeat transfer takes place through a liquid medium surrounding the submerged material under heating, in case of a/an
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Question 7 of 20
7. Question
1 pointsWhich of the following is a batch furnace ?
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Question 8 of 20
8. Question
1 pointsIn a heating process, a heat flow diagram in which the quantities of heat in the various items of a heat balance are represented by the width of a band is called the
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Question 9 of 20
9. Question
1 pointsMaximum thermal efficiency of boiler may be about __________ percent.
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Question 10 of 20
10. Question
1 pointsThe method of Lobo and Evans is concerned with the calculation of the
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Question 11 of 20
11. Question
1 pointsReverberatory furnace is used for
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Question 12 of 20
12. Question
1 pointsOverall thermal efficiency of a lumpy coal fired suitably designed heating furnace, if operated & maintained properly may be about __________ percent.
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Question 13 of 20
13. Question
1 pointsIn furnaces operating at very high temperature (say) 1250°C, e.g. soaking pit), the maximum heat transfer takes place by
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Question 14 of 20
14. Question
1 pointsWhich of the following is a directly fired intermittant furnace ?
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Question 15 of 20
15. Question
1 pointsDampers are located
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Question 16 of 20
16. Question
1 pointsOut of the following fuels used in a furnace exhausting flue gas at a temperature of 600°C, the percentage stack loss will be maximum in case of complete combustion of
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Question 17 of 20
17. Question
1 points__________ furnace is not an electric furnace.
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Question 18 of 20
18. Question
1 pointsAir filtration in a furnace
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Question 19 of 20
19. Question
1 pointsWhich of the following is the most important deterrants to an extended use of pulverised coal in boiler firing ?
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Question 20 of 20
20. Question
1 pointsWhich of the following is a periodic furnace?
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Furnace Technology MCQ 4
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Question 1 of 20
1. Question
1 pointsMetallic recuperators are not used for waste heat recovery, if the hot flue gas temperature is above __________ °C, because corrosion prevails at higher temperatures.
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Question 2 of 20
2. Question
1 pointsFurnace pressure is normally controlled by regulating the
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Question 3 of 20
3. Question
1 pointsAn example of indirectly heated furnace is the
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Question 4 of 20
4. Question
1 pointsSpecific heating capacity of a furnace is expressed as
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Question 5 of 20
5. Question
1 pointsVery high pressure boilers are usually __________ boilers.
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Question 6 of 20
6. Question
1 pointsHeat transfer rate to the charge/stock in a furnace does not depend upon the
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Question 7 of 20
7. Question
1 pointsHearth furnaces are not used for
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Question 8 of 20
8. Question
1 pointsTurn down ratio of a burner
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Question 9 of 20
9. Question
1 pointsWhich of the following is not a continuous waste heat recovery equipment from the flue gases going out of furnace ?
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Question 10 of 20
10. Question
1 pointsIn salt bath furnace, heat is transferred to the charge mainly by
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Question 11 of 20
11. Question
1 pointsCombustion of fuel in a furnace with oxygen enriched air results in higher
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Question 12 of 20
12. Question
1 pointsReducing atmosphere is maintained in a
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Question 13 of 20
13. Question
1 pointsWhile the fuel fired furnace can be used upto a maximum temperature of about 1700°C, the electric furnace can be used upto a temperature of about __________ °C.
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Question 14 of 20
14. Question
1 pointsIn case of pulverised coal fired steam boiler, the secondary air serves the main purpose of
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Question 15 of 20
15. Question
1 pointsFuel economy in an industrial furnace operation can not be achieved by the use of
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Question 16 of 20
16. Question
1 pointsThe function of an economiser in a boiler is to preheat the
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Question 17 of 20
17. Question
1 pointsCombustion of furnace oil in a furnace (soaking pit) with preheated combustion air at 400°C results in saving of about __________ percent furnace oil as compared to its combustion with atmospheric air, if the flue gas outlet temperature from the soaking pit is 1200°C.
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Question 18 of 20
18. Question
1 pointsFurnace aerodynamics is related to the __________ in the furnace.
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Question 19 of 20
19. Question
1 pointsIf the flame is produced under the hearth and then sweeps up into the heating chamber, this is called a/an __________ furnace.
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Question 20 of 20
20. Question
1 pointsOxygen enrichment of combustion air does not result in increase of the
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